TW201945822A - Laser projection module, depth camera and electronic device - Google Patents

Abstract

The present disclosure discloses a laser projection module, a depth camera and an electronic device. The laser projection module includes a laser emitter, a collimating element, a diffractive element, a detecting element, and a processor. The laser emitter is configured for emitting laser. The collimating element is configured for collimating the laser. The diffractive element is configured for diffracting the laser collimated by the collimating element, thereby forming a laser pattern. The detecting element is disposed on the collimating element, and/or the detecting element is disposed on the diffractive element. The detecting element is configured for outputting an electrical signal. The processor is connected to the detecting element. The processor is configured to receive the electrical signal, and detect whether the collimating element is abnormal, and/or detect whether the diffractive element is abnormal, according to the electrical signal.

Description

Laser projection module, depth camera and electronic device

The present invention relates to the field of optical and electronic technologies, and more particularly, to a laser projection module, a depth camera, and an electronic device.

Most mobile phones are equipped with a laser projection module. The laser projection module includes a laser emitter, a collimating element, and a diffractive element. The diffractive element is placed above the collimating element. When the phone is accidentally dropped, the collimating element and the diffractive element may fall off and / or crack.

Embodiments of the present invention provide a laser projection module, a depth camera, and an electronic device.

A laser projection module according to an embodiment of the present invention includes a laser emitter, a collimating element, a diffractive element, a detecting element, and a processor. The laser emitter is used to emit laser light. The collimating element is used for collimating the laser. The diffractive element is used to diffract the laser beam collimated by the collimating element to form a laser pattern. The detecting element is disposed on the collimating element and / or the diffractive element, and the detecting element is used for outputting an electric signal. The processor is connected to the detection element, and the processor is configured to receive the electrical signal and detect whether the collimation element and / or the diffractive element is abnormal according to the electrical signal.

A depth camera according to an embodiment of the present invention includes the above-mentioned laser projection module, an image collector, and a processor. The image collector is used to collect a laser pattern projected by the laser projection module into a target space. The processor is configured to process the laser pattern to obtain a depth image.

An electronic device according to an embodiment of the present invention includes a housing and a depth camera. The depth camera is disposed inside the casing and is exposed from the casing to acquire a depth image.

Additional aspects and advantages of the present invention will be given in part in the following description, and part of them will become apparent from the following description, or be learned through the practice of the present invention.

Hereinafter, embodiments of the present invention will be described in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention, but should not be construed as limiting the present invention.

In the description of the present invention, it is necessary to understand that the terms “first” and “second” are only used for descriptive purposes, and cannot be understood as indicating or suggesting relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless specifically defined otherwise.

In the description of the present invention, unless otherwise specified and limited, the terms "installation", "connected", and "connected" should be understood in a broad sense. For example, they can be fixed connections or detachable. Connected or integrated; can be mechanically connected, electrically connected, or can communicate with each other; can be directly connected, or indirectly connected through an intermediate medium, can be the internal communication of two elements or the mutual connection of two elements Effect relationship. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

The following disclosure provides many different implementations or examples for implementing different structures of the present invention. To simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are merely examples and are not intended to limit the invention. In addition, the present invention may repeat reference numerals and / or reference letters in different examples, and such repetition is for the purpose of simplicity and clarity and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides examples of various specific processes and materials, but those skilled in the art can realize the application of other processes and / or the use of other materials.

Referring to FIG. 1, an electronic device 3000 according to an embodiment of the present invention includes a housing 2000 and a depth camera 1000. The electronic device 3000 can be a mobile phone, a tablet computer, a laptop computer, a game console, a headset device, an access control system, a teller machine, etc. The embodiment of the present invention is described using the electronic device 3000 mobile phone as an example. It can be understood that the specific form of the electronic device 3000 Can be other, there is no limitation here. The depth camera 1000 is disposed in the casing 2000 and is exposed from the casing 2000 to obtain a depth image. The casing 2000 can provide protection to the depth camera 1000 from dust, water, and drops. The casing 2000 is provided with the depth camera 1000. Corresponding holes to allow light to pass through the holes or into the housing 2000.

Referring to FIG. 2, the depth camera 1000 includes a laser projection module 100, an image collector 200 and a processor 70. The depth camera 1000 may be formed with a projection window 901 corresponding to the laser projection module 100 and an acquisition window 902 corresponding to the image collector 200. The laser projection module 100 is configured to project a laser pattern onto a target space through a projection window 901, and the image collector 200 is configured to acquire a modulated laser pattern by a target object through a collection window 902. In one example, the laser light projected by the laser projection module 100 is infrared light, and the image collector 200 is an infrared camera. The processor 70 is connected to both the laser projection module 100 and the image collector 200. The processor 70 is configured to process a laser pattern to obtain a depth image. Specifically, the processor 70 uses an image matching algorithm to calculate a deviation value between each pixel point in the laser pattern and a corresponding pixel point in the reference pattern, and further obtains a depth image of the laser pattern according to the deviation value. . The image matching algorithm may be a Digital Image Correlation (DIC) algorithm. Of course, other image matching algorithms can be used instead of the DIC algorithm. The structure of the laser projection module 100 will be further described below.

Referring to FIG. 3, the laser projection module 100 includes a laser emitter 10, a collimating element 20, a diffractive element 30, a detecting element 40, a lens barrel 50, a substrate assembly 60 and a processor 70. The collimating element 20 and the diffractive element 30 are sequentially disposed on the optical path of the laser emitter 10. Specifically, the light emitted by the laser emitter 10 passes through the collimating element 20 and the diffractive element 30 in order and exits into the target space. The processor 70 of the laser projection module 100 may be the processor 70 of the depth camera 1000. At this time, the laser projection module 100 and the depth camera 1000 share a processor 70. At this time, the processor 70 may be used to process the laser pattern to obtain The depth image can be used to receive the electric signal output from the detection element 40 and detect whether the collimation element 20 and / or the diffractive element 30 is abnormal according to the electric signal output from the detection element 40 described below. When the processor 70 of the laser projection module 100 is not the processor 70 of the depth camera 1000, at this time, the laser projection module 100 and the depth camera 1000 do not share a processor, and the processor 70 of the laser projection module 100 is used for receiving The electric signal output by the detecting element 40 is detected and whether the collimating element 20 and / or the diffractive element 30 is abnormal according to the electric signal output by the detecting element 40. The processor 70 of the depth camera 1000 is configured to process a laser pattern to obtain a depth image. In the embodiment of the present application, an example is described in which the laser projection module 100 and the depth camera 1000 share one processor 70 as an example.

Please refer to FIG. 3 again, the substrate assembly 60 includes a substrate 62 and a circuit board 61 carried on the substrate 62. The substrate 62 is used to carry the lens barrel 50, the laser emitter 10, and the circuit board 61. The material of the substrate 62 can be plastic, such as Polyethylene Glycol Terephthalate (PET), Polymethyl Methacrylate (PMMA), Polycarbonate (PC), Polyfluorene At least one of polyimide (PI). That is to say, the substrate 62 may be made of a single plastic material of any one of PET, PMMA, PC, or PI. As such, the substrate 62 is light in weight and has sufficient support strength.

The circuit board 61 may be any one of a printed circuit board, a flexible circuit board, and a rigid-flexible board. The circuit board 61 can be provided with a via hole 611, and the via hole 611 can be used to receive the laser emitter 10. One part of the circuit board 61 is covered by the lens barrel 50, and the other part extends out and can be connected to the processor 70. The processor 70 The laser projection module 10 can be connected to a motherboard of the electronic device 3000.

Please refer to FIG. 3 again, the lens barrel 50 is disposed on the substrate assembly 60 and forms a receiving cavity 51 together with the substrate assembly 60. Specifically, the lens barrel 50 is disposed on the circuit board 61 of the substrate assembly 60 and forms a receiving cavity 51 with the circuit board 61 (that is, the side wall 53 of the lens barrel 50 is disposed on the circuit board 61 and forms a receiving cavity with the circuit board 61. 51). The lens barrel 50 may be connected to the circuit board 61 of the substrate assembly 60, and the lens barrel 50 and the circuit board 61 may be adhered with an adhesive to improve the airtightness of the receiving cavity 51. Of course, there may be other specific connection methods of the lens barrel 50 and the substrate assembly 60, for example, by a snap connection. The accommodating cavity 51 can be used for accommodating components such as the collimating element 20 and the diffractive element 30. The accommodating cavity 51 forms a part of the optical path of the laser projection module 10 at the same time. In the embodiment of the present invention, the lens barrel 50 has a hollow cylindrical shape.

Please refer to FIG. 7 and FIG. 15 together. In some embodiments, the lens barrel 50 further includes a supporting platform 52 (ie, a limiting protrusion 52) extending from the sidewall 53 of the lens barrel 50 to the receiving cavity 51. Specifically, the supporting platform 52 protrudes from the side wall 51 of the lens barrel 50 into the receiving cavity 51. The supporting platforms 52 may be in a continuous ring shape. Alternatively, the supporting platforms 52 may include a plurality of supporting platforms 52 spaced apart from each other. The light-emitting hole 1231 is enclosed by the supporting platform 52. The light-emitting hole 1231 can be used as a part of the receiving cavity 121. The laser beam passes through the light-through hole 1231 and penetrates into the diffractive element 30. At the same time, when assembling the laser projection module 100, when the diffractive element 30 and the supporting table 52 abut, it can be considered that the diffractive element 30 is installed in place, and when the collimating element 20 and the supporting table 52 abut, the collimating element 20 can be considered as installed. . The supporting platform 52 includes a limiting surface 1232. When the diffractive element 30 is mounted on the supporting platform 52, the limiting surface 1232 is combined with the diffractive element 30.

Referring to FIG. 3, the laser emitter 10 is disposed on the substrate assembly 60. Specifically, the laser emitter 10 may be disposed on the circuit board 61 and electrically connected to the circuit board 61, and the laser emitter 10 may also be disposed on the substrate 62 and Corresponds to the via 611 (that is, the laser emitter 10 is carried on the substrate 62 and accommodated in the via 611). At this time, the laser emitter 10 can be electrically connected to the circuit board 61 by arranging wires. The laser transmitter 10 is electrically connected to the processor 70 via a circuit board 61. The laser emitter 10 is used to emit laser light, and the laser light may be infrared light. In one example, the laser emitter 10 may include a semiconductor substrate and an emitting laser disposed on the semiconductor substrate. The semiconductor substrate is disposed on the substrate 62. The emitting laser may be a vertical cavity surface emitting laser (Vertical Cavity Surface). Emitting Laser, VCSEL). The semiconductor substrate may be provided with a single emission laser or an array laser composed of a plurality of emission lasers. Specifically, the plurality of emission lasers may be arranged on the semiconductor substrate in a regular or irregular two-dimensional pattern. on. The substrate 62 is also provided with a heat dissipation hole 621 (shown in FIG. 17). The heat generated by the laser emitter 10 or the circuit board 61 can be dissipated through the heat dissipation hole 621, and the heat dissipation glue can be filled in the heat dissipation hole 621 to further improve the substrate. Thermal performance of 62.

Please refer to FIG. 3 again, the collimating element 20 may be an optical lens. The collimating element 20 is used to collimate the laser emitted by the laser emitter 10, and the collimating element 20 is contained in the receiving cavity 51. The collimating element 20 includes an optical portion and a mounting portion. The mounting portion is used to combine with the side wall 53 of the lens barrel 50 and fix the collimating element 20. In the embodiment of the present invention, the optical portion includes two sides located on opposite sides of the collimating element 20. A collimated incidence surface 201 and a collimated emission surface 202.

Please refer to FIG. 7 and FIG. 15 together. When the lens barrel 50 includes the supporting platform 52, the diffractive element 30 is mounted on the supporting platform 52. Specifically, the diffractive element 30 is combined with the limiting surface 1232 to be mounted on the supporting platform 52. on. The outer surface of the diffractive element 30 includes a diffractive emitting surface 302 and a diffractive incident surface 301. The diffraction exit surface 302 and the diffraction incidence surface 301 are opposite to each other. When the diffraction element 30 is mounted on the supporting table 52, the diffraction incidence surface 301 is combined with the limiting surface 1232. In the embodiment of the present invention, a diffraction structure is formed on the diffraction incident surface 301, the diffraction exit surface 302 can be a smooth plane, and the diffraction element 30 can project the laser beam collimated by the collimation element 20 and the diffraction structure. Corresponding laser pattern. The diffractive element 30 may be made of glass, or it may be said to be made of a composite plastic (such as PET).

Referring to FIG. 3, the detecting element 40 is disposed on the collimating element 20 and / or the diffractive element 30. The detecting element 40 is used for outputting an electric signal. The processor 70 is connected to the detection element 40. The processor 70 may be configured to receive the electrical signal output from the detecting element 40 and detect whether the collimating element 20 and / or the diffractive element 30 is abnormal according to the electrical signal output from the detecting element 40. Among them, the collimation element 20 that is abnormally pointed by the collimation element 20 is cracked, tilted or detached from the laser projection module 100, and the diffraction element 30 that is abnormally pointed by the diffraction element 30 is cracked, tilted, or detached from the laser projection module 100 100 drops off.

In one embodiment, the detecting element 40 is disposed on the collimating element 20 and the diffractive element 30. The detecting element 40 is used to detect the distance between the collimating element 20 and the diffractive element 30 and output an electrical signal. The processor 70 is connected to the detection element 40. The processor 70 is configured to receive the electrical signal output by the detection element 40, determine whether the electrical signal is within a preset range, and determine that the distance between the collimating element 20 and the diffractive element 30 exceeds a change when the electrical signal is not within the preset range. Scheduled interval.

It can be understood that when the laser projection module 100 is in normal use, the laser emitted by the laser emitter 10 is sequentially emitted through the collimating element 20 and the diffractive element 30. The collimating element 20 and the diffractive element 30 have a certain energy attenuation effect on the laser. It can ensure that the emitted laser energy will not be too large to hurt the human eye. However, when the laser projection module 100 encounters a fall or the like, the collimating element 20 and the diffractive element 30 provided in the laser projection module 100 may fall off or tilt from the laser projection module 100, and at this time, the laser may be caused. The laser of the transmitter 10 does not pass through or completely passes through the collimating element 20 and / or the diffractive element 30. In this way, the emitted laser does not pass through the attenuation of the collimating element 20 and / or the diffractive element 30, and may reach a person. Eye laser energy is too high, causing damage to the human eye.

In the laser projection module 100 according to the embodiment of the present invention, a detecting element 40 is provided on the collimating element 20 and the diffractive element 30, and the distance between the collimating element 20 and the diffractive element 30 is detected by the detecting element 40. When the distance between them changes and the change value exceeds a predetermined interval, it is determined that the collimating element 20 and / or the diffractive element 30 are inclined or falling off. At this time, the processor 70 may immediately turn off the laser emitter 10 or reduce the laser emitter 10 Transmitting power, thereby avoiding the problem that the emitted laser energy is too large due to the tilting or falling of the collimating element 20 and / or the diffractive element 30, which causes harm to the eyes of the user, and improves the safety of the laser projection module 100.

Specifically, please refer to FIG. 3 to FIG. 6 together. In some embodiments, when the side wall 53 of the lens barrel 50 does not extend to the receiving cavity 51 with the supporting platform 52, the detecting element 40 may include the following situations:

(1) Please refer to FIG. 3 and FIG. 4 together. The detection element 40 may be two detection electrodes 41, and the two detection electrodes 41 are oppositely disposed to form a capacitor. The collimating element 20 includes a collimating incidence surface 201 and a collimating exit surface 202, and the diffractive element 30 includes a diffraction incident surface 301 and a diffraction exit surface 302. The positions of the two detection electrodes 41 may be: one detection electrode 41 is disposed on the collimated emission surface 202, one detection electrode 41 is disposed on the diffraction incident surface 301 (as shown in FIG. 3); or one detection electrode 41 is disposed On the collimated emission surface 202, a detection electrode 41 is disposed on the diffraction emission surface 302 (not shown); or, a detection electrode 41 is disposed on the collimated incidence surface 201, and a detection electrode 41 is disposed on the diffraction incidence surface. On the surface 301 (not shown); or, a detection electrode 41 is provided on the collimated incidence surface 201 and a detection electrode 41 is provided on the diffraction exit surface 302 (not shown). The detection electrode 41 may be made of a light-transmitting conductive material such as ITO (Indium Tin Oxide), IZO (Indium Zinc Oxide) so as not to affect the light-emitting optical path of the collimating element 20 and the diffractive element 30; or, the detecting electrode 41 may be provided at Non-optical active portions of the collimating element 20 and the diffractive element 30 (for example, a non-convex portion of the collimating element 20 and a non-diffractive grating portion portion of the diffractive element 30). The number of pairs of detection electrodes 41 may be one or a plurality of pairs. When the detection electrodes 41 are a plurality of pairs, the detection electrodes 41 of the plurality of pairs may be uniformly distributed at the peripheral positions of the collimating element 20 and the diffractive element 30 (as shown in FIG. 4). It can be understood that a capacitance is formed between two opposite detection electrodes 41. After the distance between the two detection electrodes 41 is changed, the capacitance value of the capacitance is also changed accordingly. The electrical signal output to the processor 70 can reflect the two detection electrodes 41. And the distance between the two detection electrodes 41 can be obtained according to the electrical signal, and the distance between the collimating element 20 and the diffractive element 30 can be further obtained. When the collimating element 20 and the diffractive element 30 are not detached or not inclined, the distance between the collimating element 20 and the diffractive element 30 does not change or changes within a predetermined interval; and when the collimating element 20 and the diffractive element 30 When any of them falls off or is inclined, the distance between the collimating element 20 and the diffractive element 30 will change. The electrical signal obtained by the processor 70 can reflect the change and indicate the changed collimating element 20 and the diffractive element. The distance between the elements 30. Specifically, if the change in the distance between the collimating element 20 and the diffractive element 30 is within a predetermined interval, that is, when the change in the distance between the collimating element 20 and the diffractive element 30 is small, the collimating element 20 and the diffractive element 30 30 can still work normally. At this time, the processor 70 does not need to turn off the laser transmitter 10 or reduce the transmission power of the laser transmitter 10; and if the distance between the collimating element 20 and the diffractive element 30 changes greatly, the change If the distance exceeds a predetermined interval, the processor 70 needs to perform an operation of turning off the laser transmitter 10 or reducing the transmission power of the laser transmitter 10 to avoid the problem that the emitted laser energy is too large to hurt the eyes of the user.

(2) Please refer to FIG. 5 and FIG. 6 together. The detecting element 40 may also be a transmitter 421 and a receiver 422. The transmitter 421 and the receiver 422 are disposed on the collimating element 20 and the diffractive element 30, respectively. Specifically, the transmitter 421 is disposed on the collimating exit surface 202, and the receiver 422 is disposed on the diffraction incident surface 301 (as shown in FIG. 5). Show). Alternatively, the transmitter 421 and the receiver 422 are disposed on the diffractive element 30 and the collimation element 20, respectively. Specifically, the transmitter 421 is disposed on the diffractive incident surface 301, and the receiver 422 is disposed on the collimated exit surface 202 (not shown in the figure). Show). The transmitter 421 and the receiver 422 should be disposed at the non-optical active portions of the collimating element 20 and the diffractive element 30 (for example, the non-convex portion of the collimating element 20 and the non-diffractive grating portion of the diffractive element 30) to Avoid the influence of the light emitting light paths of the alignment element 20 and the diffractive element 30. The number of pairs of the transmitter 421 and the receiver 422 may be a pair or a complex number. When the logarithm of the transmitter 421 and the receiver 422 is a complex number, the transmitter 421 and the receiver 422 of the complex pair may be evenly distributed at the peripheral positions of the collimating element 20 and the diffractive element 30 (as shown in FIG. 6). The transmitter 421 may be used to transmit light or ultrasonic waves, and the receiver 422 may be used to receive light or ultrasonic waves emitted by the corresponding transmitter 421. The light or ultrasonic waves received by the receiver 422 can be converted into electrical signals. The strength of the electrical signals can be used to characterize the strength of light or ultrasonic waves, and further characterize the distance between the collimating element 20 and the diffractive element 30. In addition, the distance between the collimating element 20 and the diffractive element 30 may also be calculated based on the time difference between the time point when the transmitter 421 emits light or ultrasonic waves and the time point when the receiver 422 receives light or ultrasonic waves; or, The distance between the collimating element 20 and the diffractive element 30 may also be calculated based on the phase difference between the light emitted by the transmitter 421 and the light received by the receiver 422. When the collimating element 20 and the diffractive element 30 are not detached or not inclined, the distance between the collimating element 20 and the diffractive element 30 does not change or changes within a predetermined interval; and when the collimating element 20 and the diffractive element 30 When any one of them falls off or tilts, the distance between the collimating element 20 and the diffractive element 30 changes, and the electrical signals obtained by the processor 70 from the transmitter 421 and the receiver 422 can reflect the change and indicate the change. The distance between the rear collimating element 20 and the diffractive element 30. Specifically, if the change in the distance between the collimating element 20 and the diffractive element 30 is within a predetermined interval, that is, when the change in the distance between the collimating element 20 and the diffractive element 30 is small, the collimating element 20 and the diffractive element 30 30 can still work normally. At this time, the processor 70 does not need to turn off the laser transmitter 10 or reduce the transmission power of the laser transmitter 10; and if the distance between the collimating element 20 and the diffractive element 30 changes greatly, the change If the distance exceeds a predetermined interval, the processor 70 needs to perform an operation of turning off the laser transmitter 10 or reducing the transmission power of the laser transmitter 10 to avoid the problem that the emitted laser energy is too large to hurt the eyes of the user. In addition, when the emitter 421 emits light, the wavelength of the light should be different from the wavelength of the laser emitted by the laser emitter 10 to avoid affecting the laser pattern formation.

Please refer to FIG. 7 to FIG. 12 together. In some embodiments, when the side wall 53 of the lens barrel 50 extends to the receiving cavity 51 with the supporting platform 52, the detecting element 40 may include the following situations:

(1) Please refer to FIG. 7 to FIG. 9 together. The detection element 40 may be two detection electrodes 41, and the two detection electrodes 41 are oppositely disposed to form a capacitor. The collimating element 20 includes a collimating incident surface 201 and a collimating exit surface 202. The diffractive element 30 includes a diffractive incident surface 301 and a diffractive exit surface 302. The supporting platform 52 is provided with a through hole 521. The positions of the two detection electrodes 41 may be: one detection electrode 41 is disposed on the collimated emission surface 202, one detection electrode 41 is disposed on the diffraction incident surface 301, and both detection electrodes 41 are housed in the through hole 521 to Form a capacitor (as shown in Figure 7). At this time, the detection electrode 41 may be made of a light-transmitting conductive material such as ITO (Indium Tin Oxide), IZO (Indium Zinc Oxide) so as not to affect the light emitting optical path of the collimating element 20 and the diffractive element 30, or may be any Made of opaque material. The number of pairs of detection electrodes 41 may be one or a plurality of pairs. When the detection electrodes 41 are a plurality of pairs, the detection electrodes 41 of the plurality of pairs may be uniformly distributed at the peripheral positions of the collimating element 20 and the diffractive element 30. At this time, the number of the through holes 521 of the bearing platform 52 may be a plurality. The holes 521 correspond to the plurality of pairs of detection electrodes 41, and each pair of detection electrodes 41 is housed in a through hole 521 (as shown in FIG. 8), or the through hole 521 of the bearing platform 52 is a ring-shaped through hole 521. The pair of detection electrodes 41 are all accommodated in the annular through hole 521 (as shown in FIG. 9). It can be understood that a capacitance is formed between two opposite detection electrodes 41. After the distance between the two detection electrodes 41 is changed, the capacitance value of the capacitance is also changed accordingly. The electrical signal output to the processor 70 can reflect the two detection electrodes 41. And the distance between the two detection electrodes 41 can be obtained according to the electrical signal, and the distance between the collimating element 20 and the diffractive element 30 can be further obtained. When the collimating element 20 and the diffractive element 30 are not detached or not inclined, the distance between the collimating element 20 and the diffractive element 30 does not change or changes within a predetermined interval; and when the collimating element 20 and the diffractive element 30 When any of them falls off or is inclined, the distance between the collimating element 20 and the diffractive element 30 will change. The electrical signal obtained by the processor 70 can reflect the change and indicate the changed collimating element 20 and the diffractive element. The distance between the elements 30. Specifically, if the change in the distance between the collimating element 20 and the diffractive element 30 is within a predetermined interval, that is, when the change in the distance between the collimating element 20 and the diffractive element 30 is small, the collimating element 20 and the diffractive element 30 30 can still work normally. At this time, the processor 70 does not need to turn off the laser transmitter 10 or reduce the transmission power of the laser transmitter 10; and if the distance between the collimating element 20 and the diffractive element 30 changes greatly, the change If the distance exceeds a predetermined interval, the processor 70 needs to perform an operation of turning off the laser transmitter 10 or reducing the transmission power of the laser transmitter 10 to avoid the problem that the emitted laser energy is too large to hurt the eyes of the user.

(2) Please refer to FIG. 10 to FIG. 12 together. The detecting element 40 may also be a transmitter 421 and a receiver 422. The transmitter 421 and the receiver 422 are disposed on the collimating element 20 and the diffractive element 30, respectively. The supporting platform 52 is provided with a through hole 521. Specifically, the transmitter 421 is disposed on the collimated emission surface 202, the receiver 422 is disposed on the diffraction incident surface 301, and both the transmitter 421 and the receiver 422 are received in the through hole 521 (shown in FIG. 10). At this time, the transmitter 421 and the receiver 422 are provided at the non-optical active portions of the collimating element 20 and the diffractive element 30 (for example, the non-convex portion of the collimating element 20 and the non-diffractive grating portion of the diffractive element 30) In order to avoid the influence of the light emitting light paths of the alignment element 20 and the diffractive element 30. The number of pairs of the transmitter 421 and the receiver 422 may be a pair or a complex number. When the logarithm of the transmitter 421 and the receiver 422 is a complex number, the transmitter 421 and the receiver 422 may be evenly distributed at the peripheral positions of the collimating element 20 and the diffractive element 30. At this time, the through hole 521 of the carrier 52 The number may be plural. The plural through holes 521 correspond to the plural detecting elements 40 one by one. Each detecting element 40 is received in one through hole 521 (as shown in FIG. 11), or the through hole 521 of the supporting table 52 is one. The annular through hole 521 and the plurality of detection elements 40 are all received in the annular through hole 521 (as shown in FIG. 12). The transmitter 421 may be used to transmit light or ultrasonic waves, and the receiver 422 may be used to receive light or ultrasonic waves emitted by the corresponding transmitter 421. The light or ultrasonic waves received by the receiver 422 can be converted into electrical signals. The strength of the electrical signals can be used to characterize the strength of light or ultrasonic waves, and further characterize the distance between the collimating element 20 and the diffractive element 30. In addition, the distance between the collimating element 20 and the diffractive element 30 may also be calculated based on the time difference between the time point when the transmitter 421 emits light or ultrasonic waves and the time point when the receiver 422 receives light or ultrasonic waves; or, The distance between the collimating element 20 and the diffractive element 30 is calculated based on the phase difference between the light emitted by the transmitter 421 and the light received by the receiver 422. When the collimating element 20 and the diffractive element 30 are not detached or not inclined, the distance between the collimating element 20 and the diffractive element 30 does not change or changes within a predetermined interval; and when the collimating element 20 and the diffractive element 30 When any one of them falls off or tilts, the distance between the collimating element 20 and the diffractive element 30 changes, and the electrical signals obtained by the processor 70 from the transmitter 421 and the receiver 422 can reflect the change and indicate the change. The distance between the rear collimating element 20 and the diffractive element 30. Specifically, if the change in the distance between the collimating element 20 and the diffractive element 30 is within a predetermined interval, that is, when the change in the distance between the collimating element 20 and the diffractive element 30 is small, the collimating element 20 and the diffractive element 30 30 can still work normally. At this time, the processor 70 does not need to turn off the laser transmitter 10 or reduce the transmission power of the laser transmitter 10; and if the distance between the collimating element 20 and the diffractive element 30 changes greatly, the change If the distance exceeds a predetermined interval, the processor 70 needs to perform an operation of turning off the laser transmitter 10 or reducing the transmission power of the laser transmitter 10 to avoid the problem that the emitted laser energy is too large to hurt the eyes of the user. In addition, when the emitter 421 emits light, the wavelength of the light should be different from the wavelength of the laser emitted by the laser emitter 10 to avoid affecting the laser pattern formation.

Please refer to FIG. 13 to FIG. 16 together. In another embodiment, the detection element 40 may be a pair of detection electrodes, which are respectively disposed on the collimated incidence surface 201 and the collimated emission surface 202 and / or the diffraction emission surface 302 and the diffraction射 pleasant face 301. That is, a detection electrode pair is provided on the collimating element 20, and two electrodes of the detection electrode pair are respectively provided on a collimating incidence surface 201 and a collimating emission surface 202; or, a diffraction electrode 30 is provided with a detection electrode pair, The two electrodes in the detection electrode pair are respectively disposed on the diffractive incident surface 301 and the diffractive output surface 302; or, both the collimating element 20 and the diffractive element 30 are provided with a detecting electrode pair, and The two electrodes in the electrode pair are disposed on the collimated incidence surface 201 and the collimated emission surface 202, respectively, and the two electrodes in the detection electrode pair on the diffraction element 30 are disposed on the diffraction incident surface 301 and the diffraction emission surface, respectively. 302 on. The detection electrode pair outputs an electric signal after being energized, and the processor 70 detects the state of the collimation element 20 according to a change in the electric signal output by the detection electrode pair provided on the collimation element 20, and according to the detection electrode provided on the derivative element 30 The change of the output electrical signal is used to detect the state of the diffractive element 30. Specifically, the processor 70 detects whether the collimating element 20 and the diffractive element 30 are broken according to changes in the output electrical signal. It can be understood that when the laser projection module 100 is in normal use, the laser emitted by the laser emitter 10 is sequentially emitted through the collimating element 20 and the diffractive element 30. The collimating element 20 and the diffractive element 30 have a certain energy attenuation effect on the laser. It can ensure that the emitted laser energy will not be too large to hurt the human eye. However, when the laser projection module 100 encounters a fall or the like, the collimating element 20 and the diffractive element 30 provided in the laser projection module 100 may be damaged. At this time, the laser of the laser transmitter 100 may not be collimated. The element 20 and / or the diffractive element 30 emit directly at the damaged position. In this way, the emitted laser does not pass through the attenuation of the collimating element 20 and / or the diffractive element 30, which may cause the energy of the laser reaching the human eye to be too high. Harm to human eyes.

In some examples, the supporting platform 52 is provided with a through hole 521, and the detection element 40 located on the collimated emission surface 202 and / or the diffraction incident surface 301 is received in the through hole 521.

Specifically, the number of the through-holes 521 may be plural. The plural through-holes 521 correspond to the detection elements 40 in a plurality of pairs, and the detection elements 40 located on the collimated emission surface 202 and / or the diffraction incident surface 301 are housed in one. In the through hole 521.

In the laser projection module 100 according to the embodiment of the present invention, a detection element 40 is provided on the collimation element 20 and / or the diffraction element 30 of the laser projection module 100, and the detection element 40 is used to detect the collimation element 20 and / or the diffraction. The electrical signal of the element 30 is used to detect whether the collimating element 20 and / or the diffractive element 30 is broken. When the processor 70 breaks, the processor 70 can immediately turn off the laser emitter 10 or reduce the transmitting power of the laser emitter 10, thereby avoiding collimation. The component 20 and / or the diffractive component 30 are damaged and the emitted laser energy is too large, which causes a problem to the eyes of the user, and improves the safety of the laser projection module 100.

In some embodiments, the detection electrode pair forms a capacitance, and the processor 70 is configured to determine whether the collimating element 20 and / or the diffractive element 30 is broken according to a change in the capacitance value of the capacitance.

Specifically, the detection electrode pair may be made of a light-transmitting conductive material such as ITO (Indium Tin Oxide), IZO (Indium Zinc Oxide) so as not to affect the light-emitting optical path of the collimating element 20 and the diffractive element 30; or, the detecting electrode The pair may be disposed on a non-optical active portion of the collimating element 20 and / or the diffractive element 30 (for example, a non-convex portion of the collimating element 20 and a non-diffractive grating portion portion of the diffractive element 30). The number of the detection electrode pairs may be one or a plurality of pairs. When the detection electrode pairs are a plurality of pairs, the detection electrode pairs of the plurality of pairs may be uniformly distributed at the peripheral positions of the collimating element 20 and / or the diffractive element 30. It can be understood that a capacitance is formed between two electrodes in each pair of detection electrode pairs. When the element is damaged, the distance between the two electrodes in each pair of detection electrode pairs changes, and the capacitance value of the capacitor changes accordingly. The electrical signals of the processor 70 can reflect the capacitance values of the two electrodes, so as to determine whether the collimating element 20 and / or the diffractive element 30 are broken. When the collimating element 20 and the diffractive element 30 are not damaged, the distance between the two electrodes in each pair of detection electrode pairs provided on the collimating element 20 and the diffractive element 30 does not change; and when the collimating element 14 When any one of the diffraction elements 30 is damaged, the distance between the two electrodes in the pair of detection electrodes provided thereon changes, and the electrical signal obtained by the processor 70 can reflect the change and indicate the changed Whether the collimating element 20 and the diffractive element 30 are broken. Specifically, the change in the distance between the two electrodes in the detection electrode pair is within a predetermined interval, that is, when the change in the distance between the two electrodes by the respective detection electrodes of the collimating element 20 and / or the diffractive element 30 is small, The collimating element 20 and the diffractive element 30 can still work normally. At this time, the processor 30 does not need to turn off the laser emitter 10 or reduce the transmitting power of the laser emitter 10; and if it is disposed on the collimating element 20 and the diffractive element 30, The distance between the two electrodes in any one of the detection electrode pairs varies greatly, that is, the changed distance exceeds a predetermined interval, the processor 70 needs to perform an operation of turning off the laser transmitter 10 or reducing the transmission power of the laser transmitter 10 In order to avoid the problem that the emitted laser energy is too large to hurt the user's eyes.

In some embodiments, the detection element 40 may also be a transmitter and a receiver. The transmitter and the receiver are disposed on the collimated incidence surface 201 and the collimated emission surface 202 and / or the diffractive incidence surface 301 and the diffractive emission surface 302, respectively. Specifically, the transmitter and the receiver should be disposed at the non-optical active portions of the collimating element 20 and the diffractive element 30 (for example, the non-convex portion of the collimating element 20 and the non-diffractive grating portion of the diffractive element 30), In order to avoid the influence of the light emission light paths of the alignment element 20 and the diffractive element 30. The number of pairs of transmitter and receiver can be a pair or a complex number. When the number of pairs of the transmitter and the receiver is a complex number, the transmitter and the receiver of the complex pair may be evenly distributed at the peripheral positions of the collimating element 20 and / or the diffractive element 30. The transmitter may be used to transmit light or ultrasonic waves, and the receiver may be used to receive light or ultrasonic waves emitted by the corresponding transmitter. The light or ultrasonic waves received by the receiver can be converted into electrical signals. The strength of the electrical signals can be used to characterize the strength of light or ultrasonic waves, and further characterize the distance between the incident surface and the exit surface of the collimating element 20 and the diffractive element 30. size. In addition, the time between the incident surface and the exit surface of the collimating element 20 and the diffractive element 30 can also be calculated based on the time difference between the time point at which the transmitter emits light or ultrasonic waves and the time point at which the receiver receives light or ultrasonic waves. Alternatively, the distance between the incident surface and the exit surface of the collimating element 20 and the diffractive element 30 may be calculated based on the phase difference between the light emitted by the transmitter and the light received by the receiver. When the collimating element 20 and the diffractive element 30 are not damaged, the distance between the incident surface and the exit surface of the collimating element 20 and the diffractive element 30 does not change; and when the When any one is broken, the distance between the incident surface and the exit surface of the collimating element 20 or the diffractive element 30 will change. The electrical signals obtained by the processor 70 from the transmitter and the receiver can reflect the change and indicate the change. The distance between the incident surface and the exit surface of the rear collimating element 20 and / or the diffractive element 30 respectively. Specifically, if the distance between the incident surface and the exit surface of the collimating element 20 and / or the diffractive element 30 changes within a predetermined interval, that is, when the distance change is small, the collimating element 20 and the diffractive element 30 can still Normal operation, at this time, the processor 70 does not need to turn off the laser emitter 10 or reduce the transmission power of the laser emitter 10; and if the distance between the incident surface and the exit surface of the collimating element 20 and / or the diffractive element 30 changes, If the variation distance is larger than a predetermined interval, the processor 70 needs to perform an operation of turning off the laser transmitter 10 or reducing the transmission power of the laser transmitter 10 to avoid the problem that the emitted laser energy is too large to damage the eyes of the user. In addition, when the emitter emits light, the wavelength of the light should not be the same as the wavelength of the laser emitted by the laser emitter to avoid affecting the formation of the laser pattern.

Please refer to FIG. 17 and FIG. 18 together. In some embodiments, the laser emitter 10 may also be a side-emitting laser. Specifically, the laser emitter 10 may be a distributed feedback laser (DFB). . The laser emitter 10 is used to emit laser light into the containing cavity 51. The laser emitter 10 has a column shape as a whole, and one end surface of the laser emitter 10 away from the substrate 62 forms a light emitting surface 11. Laser is emitted from the light emitting surface 11 and the light emitting surface 11 faces the collimating element 20. The laser projection module 100 uses a side-emitting laser as the laser emitter 10. On the one hand, the side-emitting laser has a lower temperature drift than the VCSEL array. On the other hand, because the side-emitting laser is a single-point light emitting structure, there is no need to design an array structure. It is simple to make and the cost of the laser projection module 100 is low.

When the laser of the distributed feedback laser is propagating, the gain of the power is obtained through the feedback of the grating structure. To increase the power of the distributed feedback laser, it is necessary to increase the injection current and / or increase the length of the distributed feedback laser. As the increase of the injection current will increase the power consumption of the distributed feedback laser and cause severe heat generation. Therefore, in order to ensure that the distributed feedback laser can work normally, the length of the distributed feedback laser needs to be increased, resulting in the distributed feedback laser generally having a slender structure. When the light emitting surface 11 of the side emitting laser faces the collimating element 20, the side emitting laser is placed vertically. Because the side emitting laser has a slender structure, the side emitting laser is prone to accidents such as dropping, shifting or shaking. The side-emitting laser can be fixed by setting a fixing member to prevent the side-emitting laser from falling, shifting or shaking.

Please refer to FIG. 17 to FIG. 20 together. In some embodiments, the fixing member may be the sealant 15, and the laser emitter 10 may be adhered to the substrate 62 through the sealant 15, such as the laser emitter 10 and the light emitting surface. The 11 opposite sides are bonded to the substrate 62. The side surface 12 of the laser emitter 10 may also be adhered to the substrate 62, the sealant 15 may surround the surrounding side surfaces, or only one of the side surfaces and the substrate 62 or several surfaces and the substrate 62 may be bonded. At this time, the sealant 15 may be a thermally conductive adhesive to conduct heat generated by the operation of the laser emitter 10 into the substrate 62.

Please refer to FIG. 17, FIG. 18, and FIG. 21. In some embodiments, the laser emitter 10 may also be fixed on the substrate 62 in a fixing manner as shown in FIG. 21. Specifically, the fixing member may also be an elastic support frame 16. The number of the support frames 16 is two or more. The plurality of supporting frames 16 collectively form a receiving space 161. The receiving space 161 is used to receive the laser transmitter 10, and the plurality of supporting frames 16 are used to support the laser transmitter 10. In this way, shaking of the laser emitter 10 can be prevented.

In some embodiments, the substrate 111 may be omitted, and the laser emitter 10 may be directly fixed on the circuit board 112 to reduce the overall thickness of the laser projection module 10.

In summary, the laser projection module 100, the depth camera 1000, and the electronic device 3000 according to the embodiments of the present invention are provided with a detection element 40 on the collimation element 20 and the diffraction element 30 of the laser projection module 100, and the detection element 40 is used for detection. The distance between the collimating element 20 and the diffractive element 30. When the distance between the two changes and the change value exceeds a predetermined interval, it is determined that the collimating element 20 and / or the diffractive element 30 fall off or tilt. The transmitter 70 can immediately turn off the laser transmitter 10 or reduce the transmission power of the laser transmitter 10, thereby avoiding excessive laser energy emitted due to the fall of the collimating element 20 and / or the diffractive element 30, which may be harmful to the eyes of the user. The problem is that the security of the laser projection module 100 is improved.

The laser projection module 100, the depth camera 1000, and the electronic device 3000 according to the embodiments of the present invention are provided with a detection element 40 on the collimation element 20 and / or the diffraction element 30 of the laser projection module 100, and the detection element 40 is used to detect the collimation. The electrical signal of the collimating element 20 and / or the diffractive element 30 is used to detect whether the collimating element 20 and / or the diffractive element 30 is broken. The processor 70 may immediately when any of the collimating element 20 and the diffractive element 30 is broken. Turn off the laser transmitter 10 or reduce the transmission power of the laser transmitter 10, so as to avoid the problem that the emitted laser energy is too large due to the damage of the collimating element 20 and / or the diffractive element 30, which will cause harm to the eyes of the user, and improve the laser Security used by the projection module.

In the description of this specification, the description with reference to the terms “one embodiment”, “some embodiments”, “examples”, “specific examples”, or “some examples” and the like means specific features described in conjunction with the embodiments or examples , Structure, material, or characteristic is included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms are not necessarily directed to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. In addition, without any contradiction, those skilled in the art may combine and combine different embodiments or examples and features of the different embodiments or examples described in this specification.

Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can understand the above within the scope of the present invention. Embodiments are subject to change, modification, substitution, and modification.

1000‧‧‧ Depth Camera

100‧‧‧laser projection module

10‧‧‧Laser Launcher

11‧‧‧ light emitting surface

12‧‧‧ side

15‧‧‧ Sealant

16‧‧‧ support

161‧‧‧Containment space

20‧‧‧ Collimation element

201‧‧‧ Collimated incidence surface

202‧‧‧ Collimated exit surface

30‧‧‧ Diffraction Element

301‧‧‧diffraction incident surface

302‧‧‧ Diffraction exit surface

40‧‧‧Detection element

41‧‧‧detection electrode

421‧‧‧ launcher

422‧‧‧Receiver

50‧‧‧ lens barrel

51‧‧‧ Containment Chamber

52‧‧‧bearing platform

521‧‧‧through hole

53‧‧‧ sidewall

60‧‧‧ substrate assembly

61‧‧‧Circuit Board

611‧‧‧via

62‧‧‧ substrate

621‧‧‧Ventilation holes

70‧‧‧ processor

200‧‧‧Image Collector

901‧‧‧ Projection window

902‧‧‧Collection window

1231‧‧‧light hole

1232‧‧‧ limit surface

2000‧‧‧shell

3000‧‧‧ electronic device

FIG. 1 is a schematic structural diagram of an electronic device according to some embodiments of the present invention.

FIG. 2 is a schematic structural diagram of a depth camera according to some embodiments of the present invention.

FIG. 3 is a schematic structural diagram of a laser projection module according to some embodiments of the present invention.

FIG. 4 is a schematic cross-sectional view of the laser projection module shown in FIG. 3 along the line IV-IV.

FIG. 5 is a schematic structural diagram of a laser projection module according to some embodiments of the present invention.

6 is a schematic cross-sectional view of the laser projection module shown in FIG. 5 along the VI-VI line.

FIG. 7 is a schematic structural diagram of a laser projection module according to some embodiments of the present invention.

FIG. 8 is a schematic cross-sectional view of the laser projection module shown in FIG. 7 along the line VIII-VIII.

FIG. 9 is a schematic cross-sectional view of a laser projection module according to another embodiment taken along the same cross-sectional line as the line VIII-VIII shown in FIG. 7.

FIG. 10 is a schematic structural diagram of a laser projection module according to some embodiments of the present invention.

11 is a schematic cross-sectional view of the laser projection module shown in FIG. 10 along the XI-XI line.

FIG. 12 is a schematic cross-sectional view of a laser projection module according to another embodiment, taken along the same cross-sectional line as the XI-XI line shown in FIG. 10.

FIG. 13 is a schematic structural diagram of a laser projection module according to some embodiments of the present invention.

14 is a schematic cross-sectional view of the laser projection module shown in FIG. 13 along the XIV-XIV line.

FIG. 15 is a schematic structural diagram of a laser projection module according to some embodiments of the present invention.

16 is a schematic cross-sectional view of the laser projection module shown in FIG. 15 along the XVI-XVI line.

17 and 18 are schematic structural diagrams of a laser projection module according to some embodiments of the present invention.

19 to 21 are partial structural schematic diagrams of a laser projection module according to some embodiments of the present invention.

Claims (20)

A laser projection module is improved in that the laser projection module includes: A laser emitter for emitting laser light; A collimating element for collimating the laser; A diffractive element for diffracting the laser beam collimated by the collimating element to form a laser pattern; A detection element, which is disposed on the collimation element and / or the diffractive element, and the detection element is used to output an electric signal; A processor connected to the detection element, the processor is configured to receive the electrical signal and detect whether the collimation element and / or the diffractive element is abnormal according to the electrical signal. The laser projection module according to item 1 of the scope of patent application, wherein the detection element is disposed on the collimation element and the diffraction element, and the detection element is used to detect the collimation element and the diffraction element. The processor is used to determine whether the electrical signal is within a preset range, and to determine the collimating element and the electrical signal when the electrical signal is not within the preset range. The change in the distance between the diffraction elements exceeds a predetermined interval. The laser projection module according to item 2 of the patent application scope, wherein the laser projection module further includes a substrate assembly and a lens barrel, and the substrate assembly includes a substrate and a circuit board disposed on the substrate, and the lens barrel The collimating element and the diffractive element are received in the receiving cavity and arranged on the circuit board, and are arranged along the light emitting light path of the laser emitter in sequence. According to the laser projection module of claim 3, wherein the detecting element includes two detecting electrodes; the two detecting electrodes are respectively disposed on the collimating element and the diffractive element to form a capacitor. The laser projection module according to item 3 of the patent application scope, wherein the detection element includes a transmitter and a receiver, and the transmitter and the receiver are respectively disposed on the collimating element and the diffractive element. , The transmitter is arranged corresponding to the receiver, the transmitter is used to transmit light or ultrasonic waves, and the receiver is used to receive the light or ultrasonic waves emitted by the transmitter; or The detection element includes a transmitter and a receiver, and the transmitter and the receiver are respectively disposed on the diffractive element and the collimation element, and the transmitter and the receiver are disposed correspondingly, and The transmitter is used for transmitting light or ultrasonic waves, and the receiver is used for receiving light or ultrasonic waves emitted by the transmitter. The laser projection module according to item 2 of the patent application scope, wherein the laser projection module further includes a substrate assembly and a lens barrel, and the substrate assembly includes a substrate and a circuit board disposed on the substrate, and the lens barrel The collimating element and the diffractive element are received in the receiving cavity, and arranged along the light-emitting optical path of the laser emitter in sequence, A bearing platform extends from the sidewall of the lens barrel toward the center of the receiving cavity, and the diffraction element is placed on the bearing platform. The laser projection module according to item 6 of the patent application scope, wherein the bearing platform is provided with a through hole, and the detection element includes two detection electrodes; the two detection electrodes are respectively disposed on the collimation element and the detector. The diffraction element is received in the through hole to form a capacitor. According to the laser projection module of the first patent application scope, wherein the collimating element includes a collimating incident surface and a collimating exit surface on opposite sides, and the diffractive element includes a The incident surface and the diffraction exit surface, and the detection element includes detections respectively disposed between the collimated incidence surface and the collimated exit surface and / or the diffraction incident surface and the diffraction exit surface An electrode pair, and the detection electrode pair outputs the electric signal after being energized, and the processor is configured to detect whether the collimating element and / or the diffractive element is broken according to a change in the electric signal. The laser projection module according to item 8 of the scope of patent application, wherein the detection electrode pair forms a capacitor, and the processor is configured to determine the collimating element and / or the diffractive element according to a change in the capacitance value of the capacitor. Whether it is cracked. The laser projection module according to item 8 of the patent application scope, wherein the laser projection module further includes: A substrate assembly comprising a substrate and a circuit board carried on the substrate, the circuit board is provided with a via hole, and the laser emitter is carried on the substrate and accommodated in the via hole; A lens barrel including a side wall, the side wall being disposed on the substrate assembly and forming a receiving cavity together with the substrate assembly, and the laser emitter, the collimating element, and the diffractive element all receiving In the receiving cavity and sequentially arranged on the light emitting path of the laser emitter; and The protective cover is combined with the lens barrel, the protective cover includes a protective top wall, and the protective top wall is provided with a light through hole, and the light through hole corresponds to the diffraction element. According to the laser projection module of claim 10, wherein the lens barrel further comprises a bearing platform extending from the sidewall of the lens barrel to the center of the receiving cavity, and the diffraction element is mounted on the bearing On stage. The laser projection module according to item 11 of the patent application scope, wherein the bearing platform is provided with a through hole, and the detection element located on the collimated emission surface and / or the diffraction incident surface is housed in In the through hole. The laser projection module according to item 1 of the scope of patent application, wherein the laser emitter includes a side-emitting laser, the side-emitting laser includes a light emitting surface, and the light emitting surface faces the collimating element. The laser projection module according to item 13 of the patent application scope, wherein the laser projection module further includes a fixing member and a substrate assembly, and the fixing member is used for fixing the edge emitting laser on the substrate assembly. The laser projection module according to item 14 of the patent application scope, wherein the fixing member includes a sealant, the sealant is disposed between the edge emitting laser and the substrate assembly, and the sealant is a thermally conductive adhesive . The laser projection module according to item 14 of the scope of the patent application, wherein the fixing member includes at least two elastic supporting frames provided on the substrate assembly, and at least two of the supporting frames collectively form a receiving space. The accommodating space is used for accommodating the laser transmitter, and at least two of the supporting frames are used for supporting the laser transmitter. The laser projection module according to item 2 or item 8 of the patent application scope, wherein the laser projection module further includes a substrate assembly including a substrate and a circuit board carried on the substrate, and the substrate A cooling hole is provided. A depth camera is improved in that the depth camera includes: The laser projection module described in any one of the scope of application for items 1 to 17; An image collector for collecting a laser pattern projected by the laser projection module into a target space; and The processor is configured to process the laser pattern to obtain a depth image. The depth camera according to claim 18, wherein the processor is further configured to determine a working state of the laser projection module according to an electrical signal of the detection element to control a laser emitter of the laser projection module. Launch or close. An electronic device is improved in that the electronic device includes: Housing; and The depth camera according to item 19 of the patent application scope, the depth camera is disposed in the casing and exposed from the casing to acquire a depth image.